For the past few days I'd been feeling this pinching sensation every now and then in my abdomen. My lower back was also really sore and I was really tired all the time. I was also feeling hungry pretty much all of the time. I woke up this morning feeling perfectly fine, no exhaustion, no hunger, and I've barely felt any of those pinches I'd been feeling the past few days. My back is still a little sore, but nothing like it had been since Monday (which would've been the first day of AF) I'm starting to worry. I'm in the tail end of week 4.